Thermoplastic laminate, decorative part for eyewear and process of preparation thereof

ABSTRACT

The present invention relates to a thermoplastic laminate for an eyewear, a decorative part comprising the thermoplastic laminate and a preparation process therefor. In particular, during the preparation of the laminate, a high frequency welding machine is used for bonding thermoplastic layers. The present invention uses a high frequency welding machine for the instant welding of the thermoplastic layers. Good bonding strength exists between different layers. Further, the patterns of the core layer are intact, and have high-definition images. The patterns are located in the core layer, not affected by external environmental factors, and not easily abraded. Further, multiple surfaces of the part for an eyewear have patterns, increasing the beautiful appearance of the part for an eyewear, and meeting the requirements of customers to the largest extent.

CROSS-REFERENCED TO RELATED APPLICATIONS

This is a divisional application of U.S. patent application Ser. No.14/421,152, filed Feb. 12, 2015, which is a national stage applicationof the International Patent Application No. PCT/CN2013/000952, filedAug. 13, 2013, which claims priority to Chinese Patent Application No.201210304577.2, filed on Aug. 24, 2012, all of which are incorporatedherein by reference in their entireties.

TECHNICAL FIELD

This invention relates to thermoplastic laminates, decorative parts andprocesses of preparation thereof, particularly the field of thelaminates and decorative parts for eyewear.

BACKGROUND OF THE INVENTION

Currently, the thermoplastic laminate with pattern for eyewear ismanufactured generally by silk screen printing. The silk screen printingneeds to produce a film causing high manufacturing cost and longproduction cycle. Due to the low bonding strength of laminate and inkused in the silk screen printing, it requires using an adhesive or othersolvents (such as ingredient agents) to strengthen the bonding strengthof the laminates.

In manufacturing the thermoplastic laminate with pattern by usingtransferring technology, a Japanese patent published in Dec. 2, 2004with application No. JP2003-138051 discloses a heat pressing transferprinting using sublimation ink. Since the ink penetrates or diffusesinto the laminate causing blurred patterns and low bonding strengthduring heat pressing. Moreover, the pattern of patterned resin laminatesmade by this method can only be located in an internal position,otherwise the adhesion is poor.

BRIEF DESCRIPTION OF THE INVENTION

This field now needs thermoplastic laminates, decorative parts and theirprocesses of preparation with high-definition and lifelike (vivid)design patterns. The thermoplastic laminates and decorative parts (suchas eyewear parts) provided by the present invention are colorful,unfading, unaffected by external factors, and three-dimensional. Inparticular, it is applied in the field of laminates or decorative partsfor eyewear.

In addition, the process of preparation of the thermoplastic laminatesand decorative parts of the present invention is simple and productioncycle is short. Furthermore, multiple sides of the decorative parts(such as eyewear parts) have design patterns, increasing the aestheticsof eyewear parts to satisfy the needs of this field to the largestextent.

One objective of the present invention is a method for preparing thethermoplastic laminate for eyewear and the thermoplastic laminateobtained according to the method, especially the thermoplastic laminateobtained according to the method for eyewear. The thermoplasticlaminates are welded by using a high frequency welding machine so thatthe welding of multiple thermoplastic layers with a pattern and/or anarticle can happen instantly. Specifically, the surfaces of adjacentthermoplastic layers are welded so as to enhance the bonding strengthand produce the high-definition pattern without deformation or blurring.The pattern without penetration or diffusion after transfer printingmakes the design pattern clearer. Meanwhile, in the process ofpreparation of this invention, the article located in a core layer is inintegrity and its position will not shift.

In order to achieve this objective, the present invention relates totechnical solutions of the following aspects:

In a first aspect, a method for preparing a thermoplastic laminate foran eyewear, wherein the thermoplastic laminate comprises an upper layer,a lower layer, and one or more core layers and optional one or moreinner layers located between the upper layer and lower layer, andwherein the method comprises the steps of:

-   -   1) providing the thermoplastic upper layer and lower layer;    -   2) providing one or more core layers, which are selected from a        pattern, an article and combinations thereof, located between        the upper layer and lower layer;    -   3) optionally providing one or more thermoplastic inner layers        between the upper layer and an adjacent core layer, the lower        layer and an adjacent core layer, and/or two adjacent core        layers;    -   4) bonding one or more core layers, the upper layer, the lower        layer and the optional inner layers together by using a high        frequency welding machine; and    -   5) obtaining the laminate.

Optionally, the thermoplastic laminate has one or more thermoplasticinner layers located between the upper layer and an adjacent core layer,the lower layer and the adjacent core layer, and/or the two adjacentcore layers. And the inner layer acts as a barrier to preventpenetration of color, or generates stereo effect by separating differentcore layers spatially.

In a second aspect, according to the method of the first aspect, whereinat least one of the core layers is a pattern, and wherein the pattern isfixed by a transfer printing process on a surface of the upper layer,the lower layer and/or an optional inner layer where the surface isbonded with an adjacent layer.

In a third aspect, according to the method of the second aspect, whereinthe transfer printing process comprises the steps of:

-   -   A) printing the pattern onto a transfer medium, wherein the        transfer medium is preferred to be a paper;    -   B) optionally, drying the transfer medium printed with pattern        to remove solvents and/or water, wherein the drying temperature        is from about 40° C. to about 70° C., or in particular from        about 50° C. to about 65° C.; and    -   C) transferring the pattern from the transfer medium onto a        surface of a targeted layer, wherein the preferred transferring        temperature is from about 100° C. to about 250° C.

Optionally, the printing in step A) is digital printing.

In a fourth aspect, according to the method of the third aspect, whereina sublimation ink containing a sublimation dye is used in the printingstep A).

In a fifth aspect, according to the method of the third or fourthaspect, wherein the relative humidity of air in step A) is maintainedfrom about 45% to about 80%.

In a sixth aspect, according to the method of the third to fifthaspects, wherein the transfer printing time in step C) is from about 30seconds to about 200 seconds.

In a seventh aspect, according to the method of the second to sixthaspects, wherein the thermoplastic layer with the pattern fixed by thetransfer printing process is dried by drying treatment before step 4),and the ink does not penetrate into the thermoplastic layers so as tomake a clear pattern.

In an eighth aspect, according to the method of any one of the previousaspects, wherein at least one of the one or more core layers is anarticle, wherein the article is fixed on a surface of the upper layer,the lower layer, and/or optional inner layer, where the surface isbonded with an adjacent layer, and optionally at least a position on thesurface where the article is located has a cavity having the same sizeand shape of the article.

In a ninth aspect, according to the method of the eighth aspect, whereinat least one of the one or more core layers is a pattern and at leastone of the one or more core layers is the article, and wherein thepattern and article are in the same surface or different surfaces of alayer, or on an adjacent surface or non-adjacent surfaces of differentlayers.

In a tenth aspect, according to the method of any one of the previousaspects, wherein the welding time of the high frequency welding machinein step 4) is greater than about 15 seconds, preferably greater thanabout 20 seconds and less than about 5 minutes, preferably less thanabout 1 minute, or in particular from about 30 seconds to about 50seconds.

In an eleventh aspect, according to the method of any one of theprevious aspects, wherein the electric current of the high frequencywelding machine in step 4) is greater than about 0.2 A, preferablygreater than about 0.5 A but less than about 5 A, preferably less thanabout 2 A, or in particular from about 0.6 A to about 1.3 A.

In a twelfth aspect, according to the method of any one of the previousaspects, wherein the cooling time of the high frequency welding machineused in step 4) after bonding is greater than about 0.5 minutes,preferably greater than about 1 minute but less than about 5 minutes,preferably less than about 3 minutes, or in particular about 2 minutes.

In a thirteenth aspect, according to the method of any one of theprevious aspects, wherein the thermoplastic layer prior to use issubjected to the drying and/or annealing treatment. According todifferent materials, the time and temperature of the drying and/orannealing treatment are different, generally from 50° C. to 150° C. andfrom 4 hours to 48 hours.

Another objectives of this invention are to provide a thermoplasticlaminate prepared by the above methods and their use, the processingmethod of preparing decorative parts (such as eyewear parts) havingdecorative patterns and/or articles in multiple sides with thethermoplastic laminate, and decorative parts having decorative patternsand/or articles in multiple sides obtained from the methods and theiruse.

In a fourteenth aspect, a method of preparing a decorative part for aneyewear, wherein at least two adjacent sides of the decorative partcomprise a pattern and/or an article, and wherein the method comprisesthe steps of:

-   -   1) providing a thermoplastic laminate, wherein the laminate can        be divided into a top layer and a bottom layer, and wherein the        bottom layer comprises a pattern and/or an article;    -   2) removing a portion from the top layer of the laminate to form        an exposed part at the bottom layer of the laminate        corresponding to the removed portion, and to form a surface to        be overlaid at a side of the top layer of the laminate;    -   3) optionally, coating with an adhesive the newly formed surface        to be overlaid and optional an adjacent surface to be overlaid;        and    -   4) overlaying and heat pressing the exposed part of the bottom        layer of the laminate onto the newly formed surface to be        overlaid and optional adjacent surface to be overlaid.

In a fifteenth aspect, a method of preparing a decorative part for aneyewear, wherein the method comprises the steps of:

-   -   1) providing a thermoplastic laminate;    -   2) heat pressing the thermoplastic laminate to form an outer        shell of the decorative part with decorative effect;    -   3) placing the outer shell from step 2) into a mold, and        injecting a material into the mold to form the body of the        decorative part by injection molding; and    -   4) taking the decorative part overlaid with the thermoplastic        laminate outer shell out of the mold after the injection        molding.

In a sixteenth aspect, a method of preparing a decorative part for aneyewear, wherein at least two sides of the decorative part comprise apattern and/or an article, and wherein the method comprises the stepsof:

-   -   1) providing a substrate with at least two surfaces to be        overlaid;    -   2) providing a thermoplastic laminate; and    -   3) bonding the thermoplastic laminate together with all the        surfaces to be overlaid by heat pressing and/or an adhesive.

In a seventeenth aspect, according to the method of any one of thefourteenth to sixteenth aspects, wherein the decorative part is a partof an eyewear, such as a front frame of the eyewear, a temple of theeyewear or another accessory of the eyewear such as an endtip of theeyewear.

In an eighteenth aspect, according to the method of any one of thefifteenth to seventeenth aspects, wherein the thickness of thethermoplastic laminate is less than about 5 mm, or in particular lessthan about 3 mm.

In a nineteenth aspect, according to the method of the fourteenth orsixteenth aspect, wherein the heat pressing includes placing the partsto be bonded into the mold and heat pressing the parts.

In a twentieth aspect, a thermoplastic laminate prepared by the methodof any one of first to thirteenth aspects.

In a twenty-first aspect, use of the thermoplastic laminate of twentiethaspect in preparing a part of an eyewear, such as a front frame of theeyewear, a temple of the eyewear or another accessory of the eyewearsuch as an endtip of the eyewear.

In a twenty-second aspect, a decorative part prepared by the method ofany one of fourteenth to nineteenth aspects.

In a twenty-third aspect, use of the decorative part of twenty-secondaspect in preparing a part of an eyewear, such as a front frame of theeyewear, a temple of the eyewear or another accessory of the eyewearsuch as an endtip of the eyewear.

BRIEF DESCRIPTION OF THE DRAWINGS

Preferred embodiments of the present invention will be furtherillustrated with reference to the figures below. The purpose is onlyillustrative and not restrictive.

FIG. 1 depicts an embodiment of the method of preparing a thermoplasticlaminate with a pattern of the present invention.

FIG. 2 depicts an embodiment of the method of preparing a thermoplasticlaminate with an article of the present invention.

FIG. 3 depicts an embodiment of the method of preparing a thermoplasticlaminate with a pattern and an article on the same surface of the samelayer of the present invention.

FIG. 4 depicts an embodiment of the method of preparing a thermoplasticlaminate with patterns and articles on the opposite surfaces of the samelayer of the present invention.

FIG. 5 depicts an embodiment of a thermoplastic laminate with a patternand/or an article of the present invention having a plurality of corelayers.

FIG. 6 depicts a first embodiment of the method of preparing adecorative part with patterns and/or articles on two surfaces of thepresent invention.

FIG. 7 depicts a first embodiment of the method of preparing adecorative part with patterns and/or articles on three surfaces of thepresent invention.

FIG. 8 depicts a first embodiment of the method of preparing adecorative part with patterns and/or articles on four surfaces of thepresent invention.

FIG. 9 depicts a second embodiment of the method of preparing adecorative part with patterns and/or articles on two surfaces of thepresent invention.

FIG. 10 depicts a second embodiment of the method of preparing adecorative part with patterns and/or articles on three surfaces of thepresent invention.

FIG. 11 depicts a second embodiment of the method of preparing adecorative part with patterns and/or articles on four surfaces of thepresent invention.

FIG. 12 depicts a third embodiment of the method of preparing adecorative part with patterns and/or articles on three surfaces of thepresent invention.

FIG. 13 depicts a third embodiment of the method of preparing adecorative part with patterns and/or articles on four surfaces of thepresent invention.

FIG. 14 depicts a comparison of clarity of patterns of the firstthermoplastic laminate prepared with drying step and the secondthermoplastic laminate prepared without drying step.

DETAILED DESCRIPTION OF THE INVENTION

The preferred embodiments and examples described below will be used tospecifically describe the present invention and are not intended to inany way be construed as limiting the present invention.

The term “thermoplastic” or “thermoplastic material” as used hereinrefers to any thermoplastic material suitable for the field of eyewearand used to achieve the technical solution of the present invention. Forexample, the thermoplastic material is selected from cellulose acetate,cellulose propionate, nylon (such as nylon-12) and polycarbonate etc.

The term “core layer” as used herein refers to a part for decorativeeffect, located between the upper layer and the lower layer in thethermoplastic laminate, where the part can be a pattern, an article, ora combination of both. The core layer may exist independently as a layer(such as an article) or can also form a portion of a layer (such as apattern). The core layer is not necessary to be thermoplastic and is notnecessary to have the same area as the other layer. For example, thecore layer may only form or attach to a part of the surface of the otherlayer. The core layer is also not necessary to have a specific thicknessand volume, for example, the pattern may be formed by the ink on thesurface of the other layer, or even the pattern may be formed by the inkpenetrating into the inner surface of the other layer.

The term “pattern” as used herein refers to the decorative design orfigure, formed on a substrate (such as a thermoplastic layer), which canbe formed by the conventional methods in the art, for example, printing,coating and the like. Furthermore, the “pattern” can be a planar patternor a three-dimensional pattern, such as patterns formed by convex and/orconcave. For the convex pattern, it is necessary to form a correspondingcavity on the surface of the adjacent layer. Preferably, the pattern isformed by printing, more preferably formed by transfer printing process.

The term “article” as used herein refers to an object which can existindependently and has a substantially fixed shape, for example, variousnatural or artificial decorative pieces, such as metal foil. Thearticles can be solid, or hollow, for example, filled with liquid orsolid particles in an internal cavity.

The term “inner layer” as used herein refers to the thermoplastic layer,located between the upper layer and the lower layer, which is welded asa whole with the adjacent layers during high frequency welding process.The inner layer exerts an anchor effect to core layers located therebetween. The inner layer may also act as a barrier. After the laminateis bonded, the inner layer prevents penetration of color betweendifferent colored layers (such as penetration of an ink or a toner) andthus a phenomenon of infiltration of colors. The inner layer achieves aneffect of clear appearance required by the design. Furthermore, theinner layer can also be used to separate different core layers toproduce a stereo effect in a certain space between the pattern and/orarticle. Optionally, the inner layer can also have other functions, suchas additional decorative function. The same or different thermoplasticmaterials can be used for the inner layer and the upper layer and/or thelower layer.

The term “high frequency welding machine” and “high frequency machine”can be interchangeably used herein, which refers to any high frequencyinduction heating equipment for welding the thermoplastic layerstogether.

Preparation of Core Layer

The core layer used in the present invention can be prepared by usingmethods known to a person skilled in the art, or be obtained, forexample, by the following methods.

-   1. When the core layer is a pattern, the pattern can be formed on a    thermoplastic layer by the following method.

The design pattern is designed by using a computer. The desired patternis printed onto a transfer medium, wherein the transfer medium ispreferred to be a paper. The printer used is an ink-jet printer equippedwith a sublimation ink, wherein the ink used in the printer is, forexample, the sublimation ink containing a sublimable dye. Forstrengthening the bonding strength of the subsequent laminates, the inkis preferred to be a water-based ink. Wherein, the air humility ismaintained from 45% to 80%, or even from 50% to 70%, when the desiredpattern is printed onto the transfer medium.

Optionally and preferably, the transfer medium printed with pattern isdried by drying treatment to remove excess solvents and/or water. Thisprevents the ink from diffusing and/or penetrating on the transfermedium. This ensures the clarity of the pattern on the transfer medium.The clarity of the pattern is improved accordingly after transferprinting. The drying temperature is, for example, from 40° C. to 70° C.

The design pattern printed on the transfer medium is heat transferred tothe thermoplastic layer. The preferred transfer temperature is from 100°C. to 250° C. The transfer printing time is from 30 seconds to 200seconds. In order to achieve a better transfer effect, preferably, thepattern is transferred onto a thin layer to form a patterned layer. Thetransfer effect of such mass production is stable and will not easilycause color variation. More preferably, the thin layer transfer printedwith the pattern is dried by drying treatment so that the pattern andink are fixed on the surface of the layer. This prevents the ink fromdiffusing and penetrating on the surface and/or deep into the layer andenables the pattern having a better clarity. Preferably, the pattern istransferred from the dried transfer medium to the thermoplastic layer,and the layer is then dried by drying treatment after transfer printing.

-   2. When the core layer is an article, the article can be fixed on a    thermoplastic layer or between adjacent thermoplastic layers by the    following method.

If the article is flaky, adhesive can be used to fix the article at adesigned position. When thermoplastic laminates are welded, the articledoes not move. This meets the requirements of the designed shape andposition.

If the article is thick or has three-dimensional effect, a cavity withthe same or similar shape as the article is made in the specificposition of a layer or two adjacent layers according to design. Thearticle is placed in the corresponding position of the cavity. When thethermoplastic laminates are welded, the shape of the article remainsintact, without shifting, damage or deformation. This meets therequirements of the designed shape and position. In addition, it is easyto control the quality of products, repetitive production so that thequality of the products can reach consistency even in a large-scaleproduction.

-   3. When both a pattern and an article coexist in the core layer.

The pattern is formed and the article is fixed by conventional methodsor methods 1 and 2 described above. Wherein, the pattern and article arein the same surface or different surfaces of a layer, or on an adjacentsurface or non-adjacent surfaces of different layers. The placement ofthe article combining with the pattern can be fixed (adhesive/cavity) ina specific position according to a design. The design effect ofcombining the pattern with the article is achieved in order to createunique alignment effect of the pattern and article.

Drying and/or Annealing Treatment

The drying and/or annealing treatment of the present invention can beimplemented, for example, by the following embodiment.

Different layers (the upper layer, the inner layers, the lower layer)constituting the thermoplastic laminate can be placed into an oven fordrying and/or annealing treatment which remove unnecessary components,such as water, and ensure the dimensional stability of the product. Thespecific processing condition can be adjusted according to therequirements of materials and products, wherein the drying temperatureis preferred to be from 50° C. to 150° C., and the drying time ispreferred to be from 5 hours to 48 hours.

High Frequency Welding

The high frequency welding of thermoplastic laminates of the presentinvention can be implemented, for example, by the following embodiment.

A thermoplastic layer formed with a pattern and/or fixed with an articleas obtained above is bonded together with another thermoplastic layer.The bonding is carried out by using a high frequency welding machine.Preferably, in order to make a product having a visual effect of apattern and/or article, a transparent or translucent thermoplastic layerwill be chosen for the upper layer and/or the lower layer and theoptional inner layers according to a design.

A plurality of the thermoplastic layers is stacked in the order of theupper layer, optional inner layer, and lower layer as required by adesign, wherein the pattern is formed or the article is fixed on thesurface of at least one layer to be bonded with an adjacent layer.Welding is carried out by using the high frequency welding machine.Electric current, welding time and cooling time are controlled accordingto the actual needs. For example, the welding time of the high frequencywelding machine is usually greater than 15 seconds, preferably greaterthan 20 seconds, but less than 5 minutes, preferably less than 1 minute,or even from 30 seconds to 50 seconds. The electric current is greaterthan 0.2 A, preferably greater than 0.5 A, but less than 5 A, preferablyless than 2 A, or even from 0.6 A to 1.3 A. The electric current andwelding time are adjusted according to materials, thickness, number oflayers and materials of core layer (pattern, article and the like) inorder to obtain desired bonding strength and keep the appearance of thecore layer in good shape (clear pattern, good article shape and wellpositioned). Cooling is needed in order to keep the shape of thelaminates. The cooling time is generally greater than 0.5 minutes,preferably greater than 1 minute, but less than 5 minutes, preferablyless than 3 minutes, or even about 2 minutes.

The pattern is printed by transfer printing process using a sublimationink through improvement and control of the above different processes.The pattern is transfer printed to the thermoplastic layer. Dryingprocess is also used for products from each step of the transferprinting process. Then the high frequency welding machine is used forinstant welding. This avoids penetration and/or diffusion of ink. Thepattern of the thermoplastic laminate derived from thermoplastic layeris clear and colorful. The edge of the laminate can also have thepattern. Furthermore, the bonding strength is very good.

Further description is stated below with reference to figures andpreferred embodiments for the method of preparing a thermoplasticlaminate of the present invention and the method of preparing adecorative part (such as eyewear part) with decorative patterns and/orarticles on multiple surfaces using the thermoplastic laminate of thepresent invention.

-   1. Preparing a thermoplastic laminate with a pattern

FIG. 1 shows a thermoplastic layer 31 with a pattern 21 obtained bytransfer printing method. A surface of the thermoplastic layer 31 withthe pattern 21 and an adjacent thermoplastic layer 11 are weldedinstantly by using a high frequency welding machine. A thermoplasticlaminate 4 with the pattern is obtained.

-   2. Preparing a thermoplastic laminate with an article

FIG. 2 shows a metal foil 22 with a beautiful pattern LOGO fixed on athermoplastic layer 31. A thermoplastic layer 11 and a surface of thethermoplastic layer 31 fixed with an article are welded instantly byusing a high frequency welding machine. The thermoplastic laminate withthe article is obtained.

-   3. Preparing a thermoplastic laminate with a pattern and an article

FIG. 3 or 4 shows a thermoplastic layer 31 with a pattern 21 obtained bytransfer printing method. A metal foil 22 with a beautiful pattern LOGOis fixed on the same surface (FIG. 3) of the pattern 21, or differentsurface (FIG. 4) of the pattern 21. Preferably, the metal foil relativeto the pattern is fixed at a specific position according to therequirements of a design. A thermoplastic layer 11, the thermoplasticlayer 31, and a thermoplastic layer 311 are welded instantly by using ahigh frequency welding machine. The thermoplastic laminate with thepattern and the article is obtained.

FIG. 5 shows a multilayer structure of a thermoplastic laminate with aplurality of core layers (illustrated as thin layers) having patternsand/or a plurality of core layers 2 (illustrated as thin layers) havingarticles. A plurality of core layers 2, an upper layer 1, a lower layer3 and optional inner layer (not shown) are welded by using a highfrequency welding machine. The thermoplastic laminate is obtained.

-   4. The first embodiment of the method of preparing a decorative part    with patterns and/or articles on multiple surfaces

FIG. 6 depicts a first embodiment of the method of preparing adecorative part with patterns and/or articles on two surfaces of thepresent invention. Wherein, a thermoplastic laminate with patternsand/or articles of the present invention is provided. The laminateconstitutes a decorative part 41. The decorative part can be dividedinto a top layer and a bottom layer, wherein the bottom layer comprisespatterns and/or articles (the underlined layer as shown in FIG. 6).After removing a portion from the top layer of the thermoplasticmaterial 5, the exposed part of the bottom layer 51 is overlaid and heatpressed onto the top layer. A decorative part 42 with patterns and/orarticles on two surfaces is obtained.

FIG. 7 depicts a first embodiment of the method of preparing adecorative part with patterns and/or articles on three surfaces of thepresent invention. Wherein, a decorative part 41 is made from athermoplastic laminate with patterns and/or articles of the presentinvention. After removing a portion from the top layer of thethermoplastic material 5 and 5′, the exposed part of the bottom layer 51is overlaid and heat pressed onto the top layer. A decorative part 43with patterns and/or articles on three surfaces is obtained.

FIG. 8 depicts a first embodiment of the method of preparing adecorative part with patterns and/or articles on four surfaces of thepresent invention. Wherein, a decorative part 41 is made from athermoplastic laminate with patterns and/or articles of the presentinvention. After removing a portion from the top layer of thethermoplastic material 5 and 5′, the exposed part of the bottom layer 51is overlaid and heat pressed onto the top layer. A decorative part 44with patterns and/or articles on four surfaces is obtained.

-   5. The second embodiment of the method of preparing a decorative    part with patterns and/or articles on multiple surfaces

FIG. 9 depicts a second embodiment of the method of preparing adecorative part with patterns and/or articles on two surfaces of thepresent invention. Wherein, a thermoplastic laminate 7 with a patternand/or an article of the present invention is heat pressed to asubstrate of decorative part 6 to be overlaid. A decorative part 62 withpatterns and/or articles on two surfaces is obtained.

FIG. 10 depicts a second embodiment of the method of preparing adecorative part with patterns and/or articles on three surfaces of thepresent invention. Wherein, a thermoplastic laminate 7 with a patternand/or an article of the present invention is heat pressed to asubstrate of decorative part 6 to be overlaid. A decorative part 63 withpatterns and/or articles on three surfaces is obtained.

FIG. 11 depicts a second embodiment of the method of preparing adecorative part with patterns and/or articles on four surfaces of thepresent invention. Wherein, a thermoplastic laminate 7 with a patternand/or an article of the present invention is heat pressed to asubstrate of decorative part 6 to be overlaid. A decorative part 64 withpatterns and/or articles on fours surfaces is obtained.

-   6. The third embodiment of the method of preparing a decorative part    with patterns and/or articles on multiple surfaces

FIG. 12 depicts a third embodiment of the method of preparing adecorative part with patterns and/or articles on three surfaces of thepresent invention. Wherein, a thermoplastic laminate with patternsand/or articles is heat pressed to form an outer shell 8. The outershell 8 is placed into a mold (not shown) before injecting a requiredmaterial for forming the body of the decorative part. A decorative part83 with patterns and/or articles on three surfaces is obtained.

FIG. 13 depicts a third embodiment of the method of preparing adecorative part with patterns and/or articles on four surfaces of thepresent invention. Wherein, a thermoplastic laminate with patternsand/or articles is heat pressed to form an outer shell 8. The outershell 8 is placed into a mold (not shown) before injecting a requiredmaterial for forming the body of the decorative part. A decorative part84 with patterns and/or articles on four surfaces is obtained.

EXAMPLES

The examples described below will be used to specifically describe thepresent invention. These examples are to be considered onlyillustratively and not restrictively.

Example 1. Preparing a Thermoplastic Laminate with a Pattern

A layer of cellulose acetate (CA) with a thickness of 0.5 mm was placedinto an oven for drying and/or annealing treatment, wherein the dryingtemperature was 80° C., and the drying time was 4 hours. A designpattern was designed with a computer and the design pattern was thenprinted onto a transfer paper. The printer used was an ink-jet printerequipped with a sublimation ink. The transfer paper printed with thedesign pattern was dried by drying treatment. The design pattern wasthen printed by heat transfer printing to the layer of cellulose acetate(CA) treated by the drying and/or annealing treatment. The layer ofcellulose acetate (CA) printed with the pattern by transfer printing wasdried by drying treatment. This prevented the ink from diffusing andpenetrating on the surface and deep into the layer and enables thepattern having a better clarity. Another piece of transparent celluloseacetate (CA) with a thickness of 0.5 mm was instantly welded with apatterned layer of cellulose acetate (CA) by a high frequency weldingmachine, wherein the welding time was 10 seconds, and the current was1.0 A. The thermoplastic laminate with the pattern was obtained.Furthermore, the thermoplastic layer and the patterned layer printed bytransfer printing were stacked according to the desired thickness of thethermoplastic laminate. The layers were then instantly welded by usingthe high frequency welding machine.

Table 1 is a comparison of the effect between the thermoplastic laminateprepared by the above methods and the thermoplastic laminates preparedby prior art.

TABLE 1 The comparison between the laminates of the present inventionand the prior art laminates Technology for Bonding mode of formingpattern thermoplastic layer Effect of pattern Bonding strength Silkscreen printing Heat pressing Blurred pattern, single general color Highfrequency welding Relatively clear pattern, good machine (the presentsingle color invention) Sublimation ink Heat pressing Blurred pattern,rich bad transfer printing colors; pattern can only be located in aninternal position of a laminate. High frequency welding Clear pattern,rich colors; Very good machine (the present edge of a laminate can alsoinvention) have a pattern.

Example 2. Preparing a Thermoplastic Laminate with a Pattern

2A. Preparing the Laminate, Wherein the Drying Step Was Included

A layer of cellulose acetate (CA) was placed into an oven for dryingand/or annealing treatment, wherein the drying temperature was 55° C.,and the drying time was 8 hours. A design pattern was designed with acomputer and the design pattern was then printed onto a transfer paper.The printer used was an ink-jet printer equipped with a sublimation ink.The transfer paper printed with the design pattern was dried by dryingtreatment. The design pattern was then printed by heat transfer printingonto the layer of cellulose acetate (CA) treated by the drying and/orannealing treatment. The layer of cellulose acetate (CA) printed withthe pattern by transfer printing was dried by drying treatment. Thisprevented the ink from diffusing and/or penetrating on the surface anddeep into the layer and enables the pattern having a better clarity.

Another piece of transparent cellulose acetate (CA) with a thickness of0.5 mm was placed on a surface printed with a pattern by transferprinting. The transparent cellulose acetate was instantly welded with apatterned layer of cellulose acetate (CA) by a high frequency weldingmachine, wherein the welding time was 20 seconds, and the current was0.8 A. The thermoplastic laminate with the pattern was obtained.Furthermore, the thermoplastic layer and the patterned layer printed bytransfer printing were stacked according to the desired thickness of thethermoplastic laminate. The layers were then instantly welded by usingthe high frequency welding machine. Similarly, other layers of celluloseacetate (CA) were stacked on the different surfaces of a patternedsurface according to a design. A multilayered laminate of celluloseacetate (CA) and patterned layer of cellulose acetate (CA) were theninstantly welded by the high frequency welding machine.

2B. Preparing the Laminate, Wherein the Drying Step Was Not Included

The laminate was prepared by using the same method as 2A. It simplyomitted one or more drying steps. Table 2 shows a comparison of effectsbetween the laminate obtained by methods 2A and 2B.

TABLE 2 The comparison between the laminates obtained by dryingtreatment and without drying treatment Layer printed with Effect onTransfer paper printed pattern by transfer Effect on pattern patternafter Example with pattern printing after transfer printing bonding 2AWith drying treatment With drying treatment Very clear Very clear 2BWith drying treatment Without drying Clear Relatively treatment clearWithout drying With drying treatment Clear Relatively treatment clearWithout drying Relatively clear Relatively treatment blurred

FIG. 14 shows a comparison of the effects on pattern between the firstthermoplastic laminate prepared by Example 2A and the secondthermoplastic laminate (both the transfer printing paper and the layerwere undried) prepared by Example 2B. It is obvious that the pattern ofthe first laminate was much clearer than the second laminate.

It can be seen from Tables 1 and 2 and FIG. 14 that using the transferprinting process with a sublimation ink for printing pattern and dryingproducts by drying treatment from every step of transfer printingprocess could avoid penetration or diffusion of ink. Each thermoplasticlayer was instantly welded by using a high frequency welding machineafter transfer printing the pattern onto the thermoplastic layer. Theobtained pattern of the thermoplastic laminate was clear, colorful andhaving the pattern at the edge of the laminate. The bonding strength wasalso very good.

3. Preparing an Eyewear Temple with Patterns on Three Surfaces

A piece of laminate of cellulose acetate with a thickness of 5.0 mm wasprovided. The laminate was cut into the shape of the eyewear temple by acutting machine. A mold for preparing eyewear temple was prepared. Thethermoplastic laminate prepared by example 1 was placed into the moldwith the shape of the eyewear temple. A coating layer was prepared.Adhesive was evenly coated on the coating layer. The preferred model isJP-202 in which the main ingredients were triethyl citrate andcyclohexanone. The laminate with the shape of the eyewear temple wasoverlaid by the patterned coating layer and placed into the mold forheat pressing. The eyewear temple with clear patterns on three surfaceswas obtained.

The preferred embodiments and examples described above have been used tospecifically describe the present invention but are not limited to theseembodiments and examples. A person skilled in the art understands thatvariations and modifications can be made to the above-describedembodiments and examples without departing from the spirit and scope ofthe present invention. All these modifications and variations areintended to be included herein within the scope of the presentinvention.

What is claimed is:
 1. A method of preparing a decorative part for aneyewear, wherein the method comprises the steps of: 1) providing athermoplastic laminate comprising a thermoplastic top layer, athermoplastic bottom layer, and one or more core layers and optional oneor more inner layers located between the upper layer and the lowerlayer, wherein the one or more core layers are selected from a pattern,an article and combinations thereof, located between the top layer andbottom layer; 2) removing a portion from the top layer to form anexposed part at the bottom layer corresponding to the removed portion,and to form a surface to be overlaid at a side of the top layer; 3)optionally, coating with an adhesive the newly formed surface to beoverlaid and/or an adjacent surface to be overlaid; and 4) overlayingand heat pressing the exposed part of the bottom layer onto the newlyformed surface to be overlaid and/or the adjacent surface to beoverlaid, wherein the thermoplastic laminate is prepared by a methodcomprising the steps of: a) providing the thermoplastic top layer andthe thermoplastic bottom layer; b) providing the one or more corelayers; c) optionally providing the one or more inner layers between thetop layer and an adjacent core layer, the bottom layer and an adjacentcore layer, and/or two adjacent core layers; d) bonding the one or morecore layers, the top layer, the bottom layer and the optional innerlayers together by using a high frequency welding machine; and e)obtaining the thermoplastic laminate, wherein the high frequency weldingmachine is used for a welding time greater than about 15 seconds,wherein the high frequency welding machine has an electronic currentgreater than about 0.5 A but less than about 5 A, and wherein the highfrequency welding machine is cooled for a time greater than about 0.5minutes after bonding.
 2. The method of claim 1, wherein at least twoadjacent sides of the decorative part comprise a pattern and/or anarticle.
 3. The method of claim 1, wherein the decorative part is a partof the eyewear.
 4. The method of claim 1, wherein the decorative part isa front frame of the eyewear, a temple of the eyewear or an endtip ofthe eyewear.
 5. The method of claim 1, wherein the heat pressingincludes placing the parts to be bonded.